12 timestamped notes explaining the Korean cultural context in this episode — customs, idioms, food, honorifics, and history, at the moment each appears on screen. These notes discuss events across the whole episode. To see them revealed scene-by-scene as you watch, use the episode page to find an airing.
화평's village uses the word 손 (son), which literally means 'hand' or 'guest,' as a term for an evil spirit that enters a person. The phrase 손이 온다 means 'the hand/guest is coming' — a local folk expression for the moment possession begins. This is distinct from the Catholic idea of demonic possession but points to the same fear: an outside force taking over a human body.
뒈지다 is a crude, contemptuous verb meaning to drop dead or croak. It is far harsher than the neutral 죽다 (to die) and carries real venom — roughly the equivalent of 'keel over and die' in English. Hearing it here signals that whoever is speaking has lost any pretense of normal human politeness.
노상 방뇨 literally means 'roadside urination' and is the formal term for the offence of peeing in public. Detective Bong is ribbing Gil-yeong because a key break in an earlier case came while he was relieving himself outside — an embarrassing but very Korean-drama way to stumble onto a clue. The joke lands because it is genuinely against the law and Gil-yeong has now done it twice.
A 호프집 (hopeu-jip) is a casual neighbourhood bar that mainly serves draft beer (호프, from the German Hopfen/hops) alongside fried chicken, dried squid, or other snacks. They are usually run by a single owner, often a woman, and serve as a community hangout. Yuk-gwang's not-quite-admitted romance with the 여사장 (female proprietor) fits the classic 호프집 social dynamic perfectly.
부마자 (buma-ja) is the Korean Catholic term for someone who is possessed by a demon — the subject of an 구마 (exorcism). The word comes from the Chinese characters for 'being ridden by evil.' Father Yang uses it clinically because, to a Catholic exorcist, it describes a recognised spiritual and pastoral emergency, not a folk superstition.
나눔의 손 means 'Hands of Sharing' — a common name style for Korean volunteer and welfare organisations. Attaching a local politician like Representative Park as an advisor (고문) is a very common arrangement in Korea: the politician gains a community image boost, and the charity gains connections and donations. The relationship here is being shown as cozy in a way that should make the viewer suspicious.
세습무 (sehseup-mu) are shamans who inherit their role through family lineage, as opposed to 신내림무 who are called by the spirits after a crisis illness. They are concentrated in certain regions of Korea, especially the south and southwest, and conduct ancestral rites (제사) and community ceremonies. Father Yang's mention of a 세습무 household explains why that child would be seen as especially vulnerable to — or connected with — local spirits like Bak Il-do.
Gil-yeong reveals that the female officer who saved the sole survivor of the massacre twenty years ago was his own mother. In Korea, female officers were a small minority in the 1990s–2000s, and a woman dying in the line of duty was a rare and jarring event that would have been local news. This revelation reframes every scene where Gil-yeong seemed coldly professional — his whole career has been a private search for justice.
짜장면 — thick wheat noodles in a black bean paste sauce — is Korea's ultimate delivery comfort food, eaten at celebrations, moving days, and late-night office cram sessions alike. Bong-sang's remark that Gil-yeong never eats 짜장면 makes the moment Gil-yeong asks for it quietly devastating: it echoes the birthday scene where his mother promised him exactly that meal right before she died.
The grandfather trails off with 나도 콱… 죽으려니까, implying he would kill himself if Hwapyeong is harmed. In Korean family culture this kind of statement — 'I'll just die' — is sometimes used as an extreme expression of parental desperation rather than a literal plan, but it carries real emotional weight and is meant to stop the younger person in their tracks. It shows how deeply the grandfather's guilt over the past has worn him down.
The cruel texts Yun-hui reads aloud — calling the man a 멍청한 놈 (stupid idiot), 벌레 같은 놈 (worm-like creature), and telling him to die — are a form of psychological torment. 화병 (hwa-byeong) is a Korean culture-bound syndrome literally meaning 'fire illness,' caused by suppressing anger and resentment over time. The drama is showing how sustained verbal cruelty and humiliation create the exact emotional wound — rage with nowhere to go — that Bak Il-do exploits to achieve possession.
개죽음 combines 개 (dog) and 죽음 (death) to mean dying pointlessly, with no honour or purpose — a death as worthless as a stray dog's. Calling Gil-yeong's mother's death 개죽음 is the cruelest possible insult the possessed Yun-hui can deliver, deliberately designed to break him. The comparison to a dog carries particular sting in Korean culture, where such language is among the most degrading available.